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Upload not possible with TLS 1.3

Jan1205 Guest

Upload not possible with TLS 1.3

2021-07-19 14:28

FTP upload: With TLS 1.3 the attached file could not be uploaded. With TLS 1.2 the upload successfully finished.

Please rename style_alt.css.txt in style_alt.css.

Version: WinSCP 5.19.1

style_alt.css.txt (31.97 KB)

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martin◆ Site Admin
Joined:: 2002-12-10
Posts:: 41,506
Location:: Prague, Czechia

Re: Upload not possible with TLS 1.3

2021-07-20

Please attach a full session log file both for TLS 1.2 and TLS 1.3. Also, do you mean that you can upload other files with TLS 1.3? Can you post a log for that too?

To generate the session log file, enable logging, log in to your server and do the operation and only the operation that causes the error. Submit the log with your post as an attachment. Note that passwords and passphrases not stored in the log. You may want to remove other data you consider sensitive though, such as host names, IP addresses, account names or file names (unless they are relevant to the problem). If you do not want to post the log publicly, you can mark the attachment as private.

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Guest

Re: Upload not possible with TLS 1.3

2021-07-26 10:49

martin wrote:

Also, do you mean that you can upload other files with TLS 1.3? Can you post a log for that too?

Sorry for the late answer. FTP upload is possible for TLS 1.2 and TLS 1.3. With TLS 1.3 only the attached file could not be uploaded. With other files works TLS 1.3 perfectly.

Please attach a full session log file both for TLS 1.2 and TLS 1.3.

I added two logfiles for the file style_alt.css: TLS 1.2 and TLS 1.3 (fail)

Can you post a log for that too?

You also find a log for a upload with TLS 1.3 which successfully finished.

Thank you for your support.

tls1_3_successful.log (17.81 KB)

Description: TLS 1.3 test.txt (sucessful)

tls1_3.log (18.15 KB)

Description: TLS 1.3 style_alt.css (fail)

tls1_2.log (15.02 KB)

Description: TLS 1.2 style_alt.css (sucessful)

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martin◆ Site Admin

Re: Upload not possible with TLS 1.3

2021-07-30

Thanks. I'll take a look. Can you upload the file using any other FTPS client?

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Jan1205 Guest

Upload possible

2021-07-30 16:35

The upload with another client is possible. I test here TLS 1.2 an TLS 1.3. Thank you!

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martin◆ Site Admin

Re: Upload possible

2021-08-09

Can you post verbose logs from the other client? Can I have a test account on your server?

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Jan1205
Joined:: 2021-08-10
Posts:: 2

Re: Upload possible

2021-08-11 14:53

I attached a log file from FileZilla (TLS 1.3).

Can I sent you a mail with credentials for the FTP server?

filezilla.log (5.99 KB)

Description: FileZilla, TLS 1.3

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martin◆ Site Admin

Re: Upload possible

2021-08-13

Jan1205 wrote:

Can I sent you a mail with credentials for the FTP server?

Yes please!

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Jan1205

Email

2021-08-13 12:08

I have send an email to you. Thank you for your support.

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martin◆ Site Admin

Re: Email

2021-08-13

Sorry, I have deleted your email by mistake. Can you please send it again?

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martin◆ Site Admin
Joined:: 2002-12-10
Posts:: 41,506
Location:: Prague, Czechia

Re: Email

2021-08-25

I have added this issue to the tracker:
Issue 2019 – Error when uploading file sized just below 32 kB boundary to FTP server over TLS 1.3
You can vote for it there.

Also the server needs this fix:
Issue 2018 – TLS session resumption is not working for subsequent FTP transfers with TLS 1.3 when the server requires reuse of the session of the previous transfer

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markvt
Joined:: 2021-09-21
Posts:: 1
Location:: netherlands

2021-09-21 14:57

This also seems to be the case with FileZilla Server 1.0.1.

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martin◆ Site Admin

2021-10-01

@markvt: See Issue 2030 – Timeout while uploading files to some FTP servers using TLS 1.3

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